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天然气地球科学

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天然气水合物分解引起多孔介质变形流固耦合研究

刘乐乐，鲁晓兵，张旭辉   

  1. 中国科学院力学研究所，土力学实验室，北京 100190
  • 收稿日期:2012-12-23 修回日期:2013-01-31 出版日期:2013-10-10 发布日期:2013-10-10
  • 通讯作者: 刘乐乐hydrate_liu@163.com E-mail:hydrate_liu@163.com
  • 作者简介:刘乐乐(1986-),男,河南鹤壁人,博士研究生,主要从事天然气水合物开采涉及的力学问题研究. E-mail： hydrate_liu@163.com.
  • 基金资助:

    国家自然科学基金项目“水合物热分解引起地层分层破坏实验室研究”（编号：11102209）；“冻土区天然气水合物注热开采方法研究”（编号：11272314）联合资助.


Numerical Study on Porous Media′s Deformation Due to Natural  Gas Hydrate Dissociation Considering Fluid-Solid Coupling

LIU Le-le,LU Xiao-bing,ZHANG Xu-hui   

  1. Laboratory for Soil Mechanics,Institute of Mechanics,CAS,Beijing 100190,China
  • Received:2012-12-23 Revised:2013-01-31 Online:2013-10-10 Published:2013-10-10

PDF (PC)

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摘要：

水合物地层变形是天然气水合物开采安全性评价的关键参数。提出了考虑传热、水合物分解相变、多相渗流和地层变形4个物理效应的一维多孔介质中水合物降压分解数学模型，在验证该模型适用性之后进行了粉细砂多孔介质变形敏感性分析。基于基本假设可以得到以下结论：出口压强是影响多孔介质变形的主要因素，出口压强越小，多孔介质最终变形越大，且完成变形所需时间越长。环境温度和多孔介质绝对渗透率对多孔介质最终变形没有影响，但会改变多孔介质完成变形所需时间的长度。

关键词: 天然气水合物, 多孔介质变形, 流固耦合, 数值模拟

Abstract:

A one-dimensional model for analyzing the porous media′s deformation during and after dissociation of natural gas hydrate (NGH) was developed in which conductive-convective heat transfer,two-phase fluid flow,intrinsic kinetics of NGH dissociation and deformation of solid skeleton were all included.After the certification of the numerical model,a parameter sensitivity analysis was developed.Based on the analysis,main conclusions are as follows: the deformation rate and the final deformation both decrease with the increase of the outlet pressure;the increase of the absolute permeability or the environmental temperature leads to the increase of the deformation rate,but makes no difference to the final deformation.

Key words: Natural gas hydrate, Porous media′s deformation, Fluid-solid coupling, Numerical simulation

中图分类号: 

  • TE132.2
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